diff --git a/tools/editor/object_placer.cpp b/tools/editor/object_placer.cpp
index 9f59c938..f3dfb49d 100644
--- a/tools/editor/object_placer.cpp
+++ b/tools/editor/object_placer.cpp
@@ -337,7 +337,17 @@ bool ObjectPlacer::loadFromFile(const std::string& path) {
         selectedIndices_.clear();
         uniqueIdCounter_ = 1;
 
+        // Cap object count — a stale autosave or biome-populate runaway
+        // could produce 100k+ entries that bloat the renderer instance
+        // SSBO and drag the editor framerate to single digits.
+        constexpr size_t kMaxObjects = 100'000;
+
         for (const auto& jo : arr) {
+            if (objects_.size() >= kMaxObjects) {
+                LOG_WARNING("Object cap reached (", kMaxObjects,
+                            ") — remaining entries dropped");
+                break;
+            }
             PlacedObject obj;
             obj.type = static_cast<PlaceableType>(jo.value("type", 0));
             obj.path = jo.value("path", "");
diff --git a/tools/editor/quest_editor.cpp b/tools/editor/quest_editor.cpp
index 1558ed87..59d5ae8f 100644
--- a/tools/editor/quest_editor.cpp
+++ b/tools/editor/quest_editor.cpp
@@ -77,7 +77,18 @@ bool QuestEditor::loadFromFile(const std::string& path) {
         quests_.clear();
         uint32_t maxId = 0;
 
+        // Cap total quest count — a stale autosave or hand-edited file
+        // could carry thousands of empty quests, each emitting a
+        // quest_template INSERT (and queststarter/questender + chain
+        // walks) on export. 4096 covers any realistic zone.
+        constexpr size_t kMaxQuests = 4096;
+
         for (const auto& jq : arr) {
+            if (quests_.size() >= kMaxQuests) {
+                LOG_WARNING("Quest cap reached (", kMaxQuests,
+                            ") — remaining entries dropped");
+                break;
+            }
             Quest q;
             q.id = jq.value("id", 0u);
             q.title = jq.value("title", "Untitled");